Abstract
There is a need for continuing development of CO2-soluble polymers to be used as suitable surfactants, ligands, or phase transfer agents in CO2 solvent processes. Identifying CO2/polymer solubility trends will help to enhance the search for CO2-soluble polymers. The synthesis and characterization of structurally diverse polyester libraries using high-throughput techniques combined with the use of a high-throughput gravimetric extraction (HTGE) technique for the measurement of polymer solubility in supercritical carbon dioxide has enabled the study of structure/CO2 solubility relationships. Small structural changes in polyesters have significant effects on their CO2 solubility. Branching in either the diacid moiety or diol moiety imparts a significant increase in solubility, and in particular, branching with acyl chains enhances solubility by as much as 20 times. The length of the acyl chain is significant with the solubility of the polymer increasing in a systematic way as the acyl chain length increases ...
Published Version
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